SpringMVC杂记(十七) HandlerMethodArgumentResolver接口应用example
2016-07-11 18:07
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自从spring3.1 开始就有了这个接口,可以为@RequestMapping标注的方法扩展传入的参数。
以shiro为例,扩展一个标注,@CurrentUser,只要有这个标注,就可以在shiro的安全上下文中取出适当的对象直接从参数传入,request响应函数。
Java代码
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Documented
@Target({ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
public @interface CurrentUser {
}
Java代码
@RequestMapping(value = "/test1")
public @ResponseBody String test1(@CurrentUser Long userId) {
return userId.toString();
}
@RequestMapping(value = "/test2")
public @ResponseBody String test2(@CurrentUser UserDetails userDetails) {
return userDetails.toString();
}
Java代码
import java.lang.annotation.Annotation;
import org.springframework.core.MethodParameter;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;
import com.github.yingzhuo.mycar2.annotation.CurrentUser;
import com.github.yingzhuo.mycar2.security.SecurityUtils;
import com.github.yingzhuo.mycar2.security.UserDetails;
public class CurrentUserHandlerMethodArgumentResolver implements HandlerMethodArgumentResolver {
@Override
public boolean supportsParameter(MethodParameter parameter) {
Class<?> klass = parameter.getParameterType();
if (klass.isAssignableFrom(UserDetails.class) || klass.isAssignableFrom(Long.class)) {
Annotation[] as = parameter.getParameterAnnotations();
for (Annotation a : as) {
if (a.annotationType() == CurrentUser.class) {
return true;
}
}
}
return false;
}
@Override
public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest,
WebDataBinderFactory binderFactory) throws Exception {
if ((SecurityUtils.isAuthenticated() || SecurityUtils.isRemembered()) == false) {
return null;
}
Class<?> klass = parameter.getParameterType();
UserDetails userDetails = SecurityUtils.getUserDetails();
if (klass.isAssignableFrom(UserDetails.class)) {
return SecurityUtils.getUserDetails();
}
if (klass.isAssignableFrom(Long.class)) {
return userDetails != null ? userDetails.getId() : null;
}
return null;
}
}
最后,需要配置一下
Xml代码
<mvc:annotation-driven>
<mvc:argument-resolvers>
<bean class="xxx.yyy.CurrentUserHandlerMethodArgumentResolver" />
</mvc:argument-resolvers>
</mvc:annotation-driven>
以shiro为例,扩展一个标注,@CurrentUser,只要有这个标注,就可以在shiro的安全上下文中取出适当的对象直接从参数传入,request响应函数。
Java代码
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Documented
@Target({ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
public @interface CurrentUser {
}
Java代码
@RequestMapping(value = "/test1")
public @ResponseBody String test1(@CurrentUser Long userId) {
return userId.toString();
}
@RequestMapping(value = "/test2")
public @ResponseBody String test2(@CurrentUser UserDetails userDetails) {
return userDetails.toString();
}
Java代码
import java.lang.annotation.Annotation;
import org.springframework.core.MethodParameter;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;
import com.github.yingzhuo.mycar2.annotation.CurrentUser;
import com.github.yingzhuo.mycar2.security.SecurityUtils;
import com.github.yingzhuo.mycar2.security.UserDetails;
public class CurrentUserHandlerMethodArgumentResolver implements HandlerMethodArgumentResolver {
@Override
public boolean supportsParameter(MethodParameter parameter) {
Class<?> klass = parameter.getParameterType();
if (klass.isAssignableFrom(UserDetails.class) || klass.isAssignableFrom(Long.class)) {
Annotation[] as = parameter.getParameterAnnotations();
for (Annotation a : as) {
if (a.annotationType() == CurrentUser.class) {
return true;
}
}
}
return false;
}
@Override
public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest,
WebDataBinderFactory binderFactory) throws Exception {
if ((SecurityUtils.isAuthenticated() || SecurityUtils.isRemembered()) == false) {
return null;
}
Class<?> klass = parameter.getParameterType();
UserDetails userDetails = SecurityUtils.getUserDetails();
if (klass.isAssignableFrom(UserDetails.class)) {
return SecurityUtils.getUserDetails();
}
if (klass.isAssignableFrom(Long.class)) {
return userDetails != null ? userDetails.getId() : null;
}
return null;
}
}
最后,需要配置一下
Xml代码
<mvc:annotation-driven>
<mvc:argument-resolvers>
<bean class="xxx.yyy.CurrentUserHandlerMethodArgumentResolver" />
</mvc:argument-resolvers>
</mvc:annotation-driven>
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